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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Thomazzi, Sara M. Marcondes, Sisi Moreira, Juliana De Nucci, Gilberto Antunes, Edson |
| Description | Author Affiliation: Thomazzi SM ( Department of Pharmacology, Faculty of Medical Sciences, UNICAMP, PO Box 6111, 13084-971, Campinas (SP), Brazil. thomazzi@directnet.com.br) |
| Abstract | 1. This study was designed to investigate the effects of the nitric oxide (NO) donors sodium nitroprusside (SNP), 3-morpholinosydnonimine (SIN-1) and S-nitroso-N-acetylpenicillamine (SNAP) on N-formyl-L-methionyl-L-leucyl-phenylalanine (fMLP, 1 x 10(-7) M)-induced human eosinophil chemotaxis, cyclic guanosine-3',5'-monophosphate (cGMP) levels, protein nitration and cytotoxicity. 2. Human eosinophils were exposed to SNP, SIN-1 and SNAP (0.001-1.0 mM) for either short (10 min) or prolonged (90 min) time periods. Exposition of eosinophils with these NO donors significantly inhibited the eosinophil chemotaxis irrespective of whether cells were exposed to these agents for 10 or 90 min. No marked differences were detected among them regarding the profile of chemotaxis inhibition. 3. Exposition of eosinophils to SNP, SIN-1 and SNAP (0.001-1.0 mM) markedly elevated the cGMP levels above basal levels, but the 90-min exposition resulted in significantly higher levels compared with the 10-min protocols (5.3+/-0.6 and 2.6+/-0.2 nM 1.5 x 10(6) cells(-1), respectively). The cGMP levels achieved with SNAP were greater than SNP and SIN-1. 4. The NO donors did not induce cell toxicity in any experimental condition used. Additionally, eosinophils exposed to SNP, SIN-1 and SNAP (1.0 mM each) either for 10 or 90 min did not show any tyrosine nitration in conditions where a strong nitration of bovine serum albumin was observed. 5. Our findings show that inhibitory effects of fMLP-induced human eosinophil chemotaxis by NO donors at short or prolonged exposition time were accompanied by significant elevations of cGMP levels. However, additional elevations of cGMP levels do not change the functional profile (chemotaxis inhibition) of stimulated eosinophils. |
| ISSN | 00071188 |
| e-ISSN | 14765381 |
| Journal | British Journal of Pharmacology |
| Issue Number | 4 |
| Volume Number | 141 |
| Language | English |
| Publisher | Wiley Online Library(on behalf of The British Pharmacological Society) |
| Publisher Date | 2004-02-01 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | Open |
| Subject Keyword | Chemotaxis, Leukocyte Drug Effects Cyclic GMP Physiology Eosinophils Nitric Oxide Donors Pharmacology Penicillamine Analogs & Derivatives Tyrosine Adolescent Blotting, Western Cell Survival Metabolism In Vitro Techniques Molsidomine N-Formylmethionine Leucyl-Phenylalanine Nitroprusside Tetrazolium Salts Thiazoles Research Support, Non-U.S. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Pharmacology |
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